Grinding-machine.



R. D. PIKE.

GRINDING MACHINE.

APPLICATION FILED MAR. 20. I916.

L l fifi o Patented Jan. 16,1917.

3 SHEETSSHEET l- WITNESS 2f N ZVTOR.

R. D. PIKE.

GRINDING MACHINE.

APPLICATION, FILED MAR. 20, l9l6.

1 ,21 2,552 Patented Jan. 16, 1917.

3 SHEETS-SHEET 2.

WITNESS WE'QM BY y A ATTORNEYS.

R. D. PIKE.

GRINDING MACHINE.

APPLICATION FILED MAR. 20, 1916- 1,12,552, Patented Jan. 16, 1917.

3 SHEETS-SHEET 3.

WITNESS v view, enlarged,', of one of the chucks.

I ing the ends ofv rods, as, for example, electric ROBERT D. PIKE, OFSAN FRANCISCO, CALIFORNIA.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Jan... 116, 121W.

Application filed March 20, 1916. I Serial No. 85,375.

To all whom it may concern:

Be it known that I, ROBERT D. PIKE, a citizen of the United States,residing in the city and county of San Francisco and State ofCalifornia,haveinvented certain new and useful Improvements inGrinding-Machines,

of which the following is a specification.

The present invention relates to. a grinding machine, and -moreparticularly to an apparatus for pointing or otherwise grindarc carbonsand the like. The pointing of such carbons, and. particularly those usedin projection apparatus, requires extreme care, in order to insureabsolute equality in the finished product, since a point incorrectlycentered, or of abnormal size, causes trouble-and waste in the use ofthe carbon.

Moreover, on account of the brittleness of I the carbons, great caremust be exercised to support them properly at all times, and to relievethem from all shocks and jars which would cause breakage.

The object of the invention, therefore, is to provide a machine whichautomatically. grinds the ends of carbons to correctly formed points,and which, by its continuous action, performs. the desired work withthegreatest possible efliciency.

Although the machine is designed primarily for the pointing of carbons,and is so illustrated and described hereinafter, nevertheless it mayalso be employed for pointing or grinding other objects, and may bereadily adapted to a great variety of uses without necessitating anychanges in the essential features of the invention.

In order to comprehend the invention, reference should be had to theaccompanying sheets of drawings, wherein- Figure 1 is an elevation ofthe machine. Fig. 2 is a plan viewof the same. Fig. 3 is a verticalsection, enlarged, taken on the line 3-3 of Fig. 2 and viewed in thedirection of the arrows. Fig. 4 is a part sectional Fig. 5 is amendelevation of the same. Fig. 6 is a detailed view of one of the chuckjaws and the operating sleeve therefor. Fig. 7 is an enlarged detail of,one of the supporting brackets for the chucks. Fig, 8 is a rearelevation of the same. Fig. 9 is a plan view of the same. Fig. 10 is anenlarged detail of the final carbon guiding means. Fig. 11 is a partsection enlarged of the initial carbon guiding means. Fig. 12 is a planview of. the same. In the drawings the reference numeral 1 Indicates asuitably constructed base, to which is-attached a vertically disposedcolumn and a laterally projecting bracket '3,-F1gs. 1 and 3 of thedrawings. The

bracket 3 provides a bearing for-concentric shafts 4 and 5 carryingrespective driving means 6 and 7, shown in the drawings as pulleys. Uponthe inner ends of said shafts 4 and 5 are mounted respectively bevelgears 8 and 9, which mesh with coacting bevel gears 10 and 11 fixedrespectively upon the lower ends of concentric vertical sleeves 12 and13, surrounding the central supporting column 2. Suitable thrustbearings 14 are providedat the lower ends of said vertical sleeves tosupport the weight thereof, and

suitable radial bearings 15 are provided at the upper ends of saidsleeves.

The outer sleeve 13 carriesat its upper end a turret 16Figs. 1, 2 and 3of the drawings, to which the carbon holding chucks are attached in thefollowing manner: .Mounted for sliding movement in a direction radialwith respect to said turret 16, in suitably formed guides 17, (Figs. 3,7, 8 and 9 of the drawings), is a bracket 18 carrying on its outer end abearing 19, shown as comprising two diametrically divided parts heldtogether by screws 20. "Said bracket 18 has an upwardly projecting lug21, bored and interiorly threaded to receive an adjusting screw 22, saidscrew passing through and having a bearing in a cross piece 23 bridgingthe guides. Thrust collars 24 and a lock nut 24" are provided on saidadjusting screw 22, on either side of the bridge 23, to retain saidscrew-in its proper lineal posi 'tion. The outer end of the adjustingscrew 22 is preferably formed to receive a wrench as shown at 25. Theguides 17 are preferably mounted upon the turret 16 with theinterposition of resilientcushions 17 of rubber or other similarmaterial, to absorb the shocks due to the grinding action.

In the drawings, four carbon holding chucks are shown disposed about theperiphery of the turret 16, althou h it is to be understood that anynumber c said chucks may be used within the limits of structural andoperative practicability, each chuck being independently adjustableradially of the turret by the means described above. Each carbon holdingchuck is rotatably mounted in the bearing 19 of the sliding bracket 18,said chuck being provided for this purpose with a reduced exteriordiameter 26 (Fig. 4 of the drawings) bounded at each end bythrust'flanges, or bearings 27. Said chuck is inclosed within a shell 28upon the upper end of which is carried abevel gear 29, said gear meshingwith a large bevel gear 30, (Figs. 1 and 3 of the drawings), mountedupon the upper end of the vertical sleeve 12.

Thus it will be seen that by the slow rotation of the turret 16, drivenby the pulley 7, the carbon holding chucks are carried around in acontinuous circular path, and by the more rapid rotation of the gear 30,driven by the pulley 6, the carbon holdingchucks are individuallyrotated at a high rate of speed within their respective journals 19.

The mechanism of the carbon holding chucks, all Of'RWlllCll areidentical, may be described as follows, with reference to Figs. 4 and 5of the drawings. The shell 28 car- 'ries at its outer or lower end aring in which are forined substantially longitudinal inclined guide-ways32, each of said ways being adapted to receive and support a sliding jaw33, the inner surface thereof being parallel with the axis of the chuckand formed with teeth 34 for gripping the'car 'bon, or other stock to beoperated on, as

shown in Fig. 5 of the drawings. Three of.

said jaws 33 are illustrated in the preferred form of the-chuck,although more may be. used, if desired. Within theshell 28 of the chuckis a slidably mounted sleeve 35-'Fig.

in the flange 36 of said sleeve, and having sliding movement thereinradially with respect to the chuck. Thus it will readily be seen that aninward lineal movement of the sleeve 35, as caused by the spring 38,moves the jaws 33 within their inclined guides 32, which movementresults in moving said jaws inwardly toward the center of the chuck;

and opposite movement of the sleeve 35 causes an outward movement orexpanding said jaws. By reversing the inclination the guides 32 and theaction of the spring the jaws may be made to close upon an outwardmovement of the sleeve 35, if such movement be more desirable than thatdescribed above.

The outer ends of the sleeves 35 of th carbon holding chucks carry camfollowers 43 rotatably mounted in suitable bearings 44 and adapted tofollow a face cam 45 carried at the periphery of a fixed table 46mounted upon the upper end of the vertical supporting column 2. Said cam45 causes the chucks to be opened andclosed by rais ing and lowering thecam followers 43, as said chucks are carried around by the rotation ofthe turret 16.

Projecting from the base 1 on one side thereof is a bracket 47 (Figs. 1and 2 of the drawings) which carries an arcuate guide platet48. Saidguide plate 48, as shown in Figs. 11 and 12 of the drawings, isadjustably mounted upon the bracket 47 and secured thereto as by meansofbolts 49, and is inclined, as shown, to a position perpendicular tothe axis of the carbon 53 within the chuck, and its upper-surface isserrated as shown at 50, the teeth thereof being pointed in a directionopposite to that of the rotation of the turret 16. A slot 51 is providedin the upper face of saidgu'ide 48, and discharge apertures 52 extendfrom the bottom of said slot through said guide for a purposehereinafter set forth.

In the operation of the apparatus, when the cam follower 43 of a chuckrides upon the raised portion 45 of the cam 45 at the position A in Fig.2 of the drawings, the jaws of that chuck are then opened. W hen saidchuck, by the rotation of the turret 16, is carried over the end of theguide 48, a carbon is dropped into the upper end of the chuck bytheoperator, or in any convenient manner, not shown in the drawings. Thecarbon falls through the chuck until its end rests upon the guide 48asshown in Fig. 11 of the drawings, whereupon any soft material adheringto the end of the carbon 58 is'renioved therefrom by the teeth of saidguide, and falls through the apertures 52. The cam follower 43 runs ofithe end of the raised portion 45 of the care before the carbon reachesthe end of the guide 48, and said carbon is thereby firmly clamped inthe chuck in the desired lineal position for grinding. At the positionB-Figs 2 and 3 of the drawings,.the lower protruding end of the carbon53 is carried across the face of a preferably dished grinding wheel 54,said wheel being set obliquely with respect to saidcarbon, so that assaid carbon is can ied across the face of said wheel, and rotated uponits axis as described above, a point of the proper form is formed uponsaid carbon. The grinding wheel 54 is preferably driven from a motor 55in any convenient manner, as, for example, by a belt 56, and is mountedin such. a manner as to provide for adjustment thereof relative to thecarbon 53 at said position B. F or purposes of illustration l have shownthis mounting ofthe grinding mechanism as comprising a fixed stand57Fig's. l and 2 of the drawings, upon which is carried for vertical andhorizontal adjustment a bracket 58 and upon this bracket in turn aremounted the grinding wheel. at and the driving motor 55. Suitable meansare provided, as indicated at 59, for adjusting said bracket in avertical arcuate path to movethe grinding wheel toward or away from thecarbon 53. A similar grinding mechanism is preferably provided at theposition C-Fig. 2 of the drawings, having a grinding wheel 54: and azdriving motor mounted upon a stand 5 54 and 54,- relative to the carbon53 are such that the point is roughly formed by the wheel 5% at theposition B and finished by the wheel 5% at the position C. Immediatelyafter the carbon-53 is carried free of the grinding wheel 54, the camfollower 43 rides upon a short raised portion 45" of the cam to, therebymomentarily opening the chuck and allowing the carbon 53 to fall untilits end rests upon a final guide plate 60, adjustably carried by abracket 62, Fi 2 of the drawings, extending laterally and upwardly fromthe base 1. This guide plate is illustrated in Fig. 10 of the drawingsas arcuate in form, disposed perpendicularly to the carbon 53 andprovided with a tapered arcuate slot 61 into which the point of thecarbon 58 The carbon is thus limited in its downward movement within there leased chuck bythe diameter of its point. The chuck is thereuponclosed to again grip the carbon, the continued rotation of the turret 16carncs the pointed lower end of said carbon over the face of an endgrinding wheel 63, said wheel being preferably driven by a motor 6 l-lig.. l of the drawings, mounted suitably termed bracket 65 extending romsupp rted vby the bracket grinding wheel 63 grinds the end the pointedcarbon to the proper si ereby insuring the proper length of" The chuckis thence carried to the posi"'on fir-Fig, 2 of the drawings, where thecarbon is released and allowed into a discharge chute 66- ig. l of cdrawings, from whence it is e reloaded.'

The o 'on of the machine is continuousat a flies, carbons are fed intothe chucks successively and are successively carried past guiding platet8, the two poi wheels 5% and .5 2, the final guiding i th finishingwheel 63 by the 1e turret 16, Moreover, the i. I nuously is ready Thepositions of the grinding wheels convenient means, and the chuck thenassumes its original position, and

rotated at relatively high speed by the gear 30. The machine thereforeoperates with the greatest possible efiiciency.

l have hereinbefore described and illustrated my invention in itspreferred form. I do not Wish, however, to be construed as limitingmyself to said preferred form, for the reason that many changes may bemade in the device without in anyway afiecting the principles of theinvention, and 11 there; fore wish to be understood as claiming theinvention as broadly as the state of the art will permit.

Having thus described my invention, what it claim as new and desire toprotect by Letters Patent is 1 1., In an apparatus for the describedpurpose, the combination with a plurality of grinding means, of a devicefor holding the work to be ground, mechanism for moving said holdingdevice tocarry the work successively into and out of the spheres ofaction ofthe grinding means, means for correctly positioning said workwithin said holding device prior to the first grinding operation, andmeans for ire-positioning said work within said holding device aftersaid first grinding operation.

2. in an apparatus for the described purpose, the combination with aplurality of grinding means, of a device for holding the work to beground, mechanism for moving said holding device to carry the work :successively into and out of the spheres of action of the grinding means,means for correctly positioning said work within saidholding deviceprior to the first grinding operation, and means for actuating saidholding device to cause the samerto release said work after said firstgrinding operation, to enable said work to be repositioned within saidholding device.

3. In an apparatus for described purpose, the combination withadjustable grinding means, of a device for holding the work to beground, means for rotating said holding device upon its axis, mechanismfor moving said holding device to carry the workinto and out of thesphere of action of.

the grinding means, and means for universally adjusting said meansrelative to said worlr, I

1-. ln an apparatus for-the described. purpose, the combination aplurality of grinding means, of a device for holding the work to beground, mecuanism for carrying said holding device into and out of thesphere of action of t e grinding means, means for adjusting said"holding device on said carrying mechanism, and adjustable devices forcorrectly positioning the work within said holding device,

In an apparatus fo the described the combination *r' T a piural of adeuce tor holdthe pose,

turret to carry the work intooperative relation with said grindingmeans.

7 In an apparatus for the described purpose, a rotatable turret, abracket carried in the peripheral region thereof, a resilient cushioninterposed between said bracket and said turret, a device rotatablycarried Withinsaid bracket for holding the work to be ground, means forrotating said holding de vice within said bracket, grinding meanspositioned in proximity to said turret, and

mechanism for rotating said turret to carry' the work into operativerelation with the grinding means.

8. In an apparatus'for the described purpose, a rotatable turret, achuck rotatably mounted thereon for holding the work to be ground,grinding means positioned in proximity to said turret, a guide plateassociated with said turret for positioning the work within said chuck,and mechanism for rotating said turret to carry the work into operativerelation with the grinding means.

9. In an apparatus for the described purpose, a rotatable turret, arotatable chuck carried thereby for holding the work to be ground,grinding means positioned in proximity to said turret,an adjustableguide plate for positioning the work within said chuck, and mechanismfor rotating said turret to carry the'work into operative relation withthe grinding means.

10. In an apparatus for the described purpose, a rotatable turret,devices carried thereby for holding the Work to be ground, a grindingwheel positioned in proximity to said turret, said grinding wheel havinga concave grinding face and being positioned with one edge of said facecloser to said turret than the other, means for operating said grindingwheel, and mechanism for rotating said turret to carry the work acrossthe operative face ofsaid grinding wheel.

11. In an apparatus for'the described purose a rotatable turret devicescarried thereby for'holding the work to be ground,

a grinding wheel positioned in proximity to said turret, said rindingwheel having a concave grinding ace and being adjustably mounted withrespect to said turret, means ing the'work in operative relation to saidwheels, a guide for positioning said work within sald chuck, andmechanism for moving said chuck 'to carry the work into operativerelation successively with said grinding wheels.

14'. A pointing machine comprising a grinding wheel, a chuck forholding'the work in inclined relation thereto, a guide for positioningsaid work within said chuck, comprising an arcuate plate having aserrated upper surface, and mechanism for moving said chuck to carry thework across the surface of said guide plate and into operative relationwith said grinding wheel.

15. A, pointing machine comprising 'a' chuck for holding the work to bepointed, grinding means for pointing said work, means for transverselygrinding the end of the pointed work, and mechanism for moving saidchuck to carry the work into operative relation successively with saidpoint grinding means and said end grinding means.

16. A pointing machine comprising a chuck for holding the Work tobe-pointed, a guide for positioning the work within said chuck, grindingmeans for pointing the work he d by said chuck, a second. guide forre-positioning the work within said chuck, means for transverselygrinding the end ;of the pointed work, and mechanism for moving saidchuck to carr said work successively from said first guiding meansthrough the sphere of action of said point grinding means, said secondguiding means and said end grinding means. Y 17.- A pointing machinecomprising a rotatable turret, a chuck carried thereby for holding thework to be pointed, a guide plate for positioning the work within saidchuck, a grinding wheel positioned in proximity to said turret forpointing the work within said chuck, a second guide plateforre-positioning the work within said chuck, said plate having an arcuatetapered slot for receiving the point of the work, a second grindingwheel for finishing the end of the pointed work, and mechanismfor'rotating said turret to carry the work successively from said firstguide plate across the operative face of first grinding wheel, over saidsecond guide plate, and across the operative face of said endfinishingwheel.

,in said chuck, a grinding wheel having a concave operative facepositioned in proximity to said turret, a second guide plate, a secondgrinding wheel for transversely finishing the end of the pointed work,means for operating said grinding wheels, means forcontinuously rotatingsaid chuck, mechanism for continuously rotating said turret to carry theWork from the first mentioned guide plate across the operative face ofsaid first grinding wheel, over said second guide plate, and across theoperative face of said second grinding wheel, and means actuated by therotation of said turret to open said chuck to release the work heldtherein when said work is carried over said guide plates, and to closesaid chuck upon said work when carried into operative relation with saidgrinding wheels.

19. A pointing machine comprising a rotatable turret, a plurality ofindependently rotatable chucks carried thereby for holdin the work to bepointed, a grlnding whee positioned in proximity to said turret forinitially grinding a point upon said work, a

second grinding wheel positioned in proximity to said turret forcompleting the point upon said work, a third grinding wheel fortransversely flushing the end of the pointed work means for rotatingsaid chucks, and mechanism "for rotating said turret to carry the workinto operative relation successively with said grinding wheels.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ROBERT D. PIKE.

Witnesses:

HARRY A. To'I'rEN, D.'B. R104 m

